EP1259476B1 - Chloration d'une aniline en ortho dans un milieu fluorhydrique - Google Patents
Chloration d'une aniline en ortho dans un milieu fluorhydrique Download PDFInfo
- Publication number
- EP1259476B1 EP1259476B1 EP01909919A EP01909919A EP1259476B1 EP 1259476 B1 EP1259476 B1 EP 1259476B1 EP 01909919 A EP01909919 A EP 01909919A EP 01909919 A EP01909919 A EP 01909919A EP 1259476 B1 EP1259476 B1 EP 1259476B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- aniline
- chlorine
- chlorinated
- process according
- chlorination
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D231/00—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
- C07D231/02—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings
- C07D231/10—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D231/12—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
- C07C209/68—Preparation of compounds containing amino groups bound to a carbon skeleton from amines, by reactions not involving amino groups, e.g. reduction of unsaturated amines, aromatisation, or substitution of the carbon skeleton
- C07C209/74—Preparation of compounds containing amino groups bound to a carbon skeleton from amines, by reactions not involving amino groups, e.g. reduction of unsaturated amines, aromatisation, or substitution of the carbon skeleton by halogenation, hydrohalogenation, dehalogenation, or dehydrohalogenation
Definitions
- the present invention relates to a process for synthesizing a chlorinated aniline on the ring and comprising at least one sp 3 hybridization carbon atom which is both perhalogenous and carries a fluorine atom. It relates more particularly to the chlorination of an aniline precursor of said chlorinated aniline in a hydrofluoric medium.
- the synthesis of fluorinated derivatives is often delicate because the direct fluoridation reactions are most often too violent and too selective so that we can implement them.
- the synthesis of fluorinated derivatives often involves the exchange of various substituents with fluorine, and in particular the exchanges of heavier halogens with fluorine.
- the most used reagent and the cheapest to carry out the exchange is undeniably hydrofluoric acid in the liquid phase.
- Hydrofluoric acid has various properties that come out of the ordinary and makes the reactions made within a hydrofluoric environment slightly predictable and in any case different from the results obtained with the techniques usual.
- liquid hydrofluoric acid is a particularly aggressive and where many associations by hydrogen bonding take place; on the other hand, hydrofluoric acid forms with amines, and especially with weak amines and with aromatic heterocycles, complex extremely stable that it is difficult to treat and to give back the free amine and hydrofluoric acid.
- an aniline binds with four molecules of acid hydrofluoric fluid that will need to be neutralized to release the amine.
- Hydrochloric acid released by the chlorination of aniline must subsequently be neutralized to religorate the amine.
- the problem is particularly acute in the case of anilines which carry on a lateral chain a carbon of perhalogenated sp 3 hybridization, and in particular perfluorinated.
- one of the aims of the present invention is to provide a process which comprises a chlorine / fluorine exchange step in an acidic medium hydrofluoric fluid (with or without thinner) and which avoids double release of aniline once with hydrofluoric acid and another time with hydrochloric acid.
- Another object of the present invention is to provide a method which allows a good recovery of hydrofluoric acid bound to anilines.
- Another object of the present invention is to provide a method of the type preceding that allows a limitation of the saline discharges of the process.
- perhalogenated carbon a carbon of sp 3 nature, not carrying hydrogen and comprising, in addition to its bond with aryl or chalcogen, at most 2, advantageously at most 1, radicals, all other atoms being halogens; said radicals are advantageously chosen from electron-withdrawing groups, especially when there are 2 of them.
- the present invention is particularly useful for anilines which carry an electron-withdrawing group in the para position of the amine function.
- This electroattractor group is advantageously an electron-withdrawing group by inducing effect, and in particular the perhalogenated groups on carbon in binding with the aromatic ring of aniline.
- the hydrofluoric medium may be either liquid hydrofluoric acid or a hydrofluoric acid diluted in a solvent.
- This hydrofluoric medium may simply consist of amine complexed by several molecules of hydrofluoric acid, usually from 2 to 5, the more often 4.
- the HF / aniline ratio is between 2 and 10, advantageously between 4 and 8. The upper limits have only one meaning economic.
- aniline can be made in situ by decomposition of carbamoyl fluoride, this implementation is not preferred because of the risk of fluorophosgene (COCl 2 ) emission.
- the possible "liberation" of the amine from its carbamoyl fluoride is carried out before proceeding with the chlorination.
- the solvents used are advantageously solvents known to allow ionic chlorination (chlorination with a Cl + species).
- the present invention it is possible to realize a monochlorination or especially a dichloration, the monochlorination intervening in ortho, the dichloration being essentially ortho-ortho 'of the aniline function.
- Chlorination usually occurs at a temperature between 0 and 150 ° C, preferably between 20 and 120 ° C.
- the chlorine be introduced so that the medium always remains chlorinating, in other words the rate of consumption of the chlorinating agent (e.g., chlorine) is at most equal to the rate of introduction into the medium of said chlorinating agent.
- the rate of consumption of the chlorinating agent e.g., chlorine
- introducing the chlorine of so that it is over-stoichiometric with respect to the desired reaction constitutes an operating parameter improving both the yield and the selectivity. This surstoechiometry is advantageously performed during the almost all of the reaction.
- the substrate and chlorine are introduced gradually and simultaneously on a foot of solvent or reaction mass, brought and maintained at the correct temperature.
- Lewis acid such as boron trifluoride, although promoting the reaction, is not necessary.
- the molar amount of optional Lewis acid is advantageously between 10 -4 and 10 -1 relative to the substrate.
- the pressure at which the reaction is conducted is either atmospheric pressure, a pressure greater than the pressure atmospheric, preferably autogenous.
- the chlorinating agent is advantageously chlorine, which is introduced into the reaction medium is advantageously in the form of a gas.
- This introduction is advantageously carried out by bubbling in the reaction medium, this introduction being preferably carried out at a rate at least equal to that defined by that of the substrate, multiplied by the stoichiometry of the intended reaction (in general 2 moles of chlorine per 1 mole of substrate).
- hydrochloric acid is released. It can then be used to regeneration of chlorine either by the Deacon process or by electrolysis.
- Hydrochloric acid especially for small installations, may also serve to regenerate chlorine by action on a hypochlorite.
- the rejection of saline derivatives is more important than in the case of Deacon process or electrolysis process.
- Another advantage of the present invention is to make it much easier the liberation of aniline from its hydrogenofluorinated complexes thus allowing a better hydrofluoric acid recycling and additional gain at the saline discharges.
- This release can, of course, be carried out under pressure greater than the atmospheric pressure, in which case the release temperature aniline takes place at a higher temperature. It can be conducted under reduced pressure in which case the release temperature occurs at a lower temperature.
- the chlorination of the anilines targeted by the present invention makes it possible a complete, easy and non-productive release of salts in complexes aniline-hydrofluoric acid.
- the substrates well adapted to the present invention are the substrates corresponding to the following general formula.
- the present invention is particularly particularly advantageous for monochlorination and dichlorination of trifluoromethylanilines and, in particular, for mono- and especially dichloration of paratrifluorochloroaniline.
- This technique opens a way for the synthesis of an N-phenylpyrazole, dichlorinated in the ortho-ortho position of the pyrazole and carrying in the para position an electron-withdrawing group, advantageously a sp 3 hybridization carbon atom which is both perhalogenous and carries a fluorine atom, comprising a step of chlorinating aniline according to the invention.
- dichloroparatrifluoromethylaniline it should be mentioned that it is, in particular, used to carry out, by stages known per se, the insecticide known under the name Fipronil.
- the amount of pTFMA introduced is 1 mole.
- the operating parameters and the results obtained are collated in the following table.
- Test no Temperature Cl 2 / pTFMA molar ratio
- Duration of introduction of chlorine Substrate introduction time Reaction yield Conversion rate 1 115 ° C ⁇ 2 3.25 2 hours 2 hours ⁇ 99% 99.9% 2 105 ° C ⁇ 2 3 2 hours 1h 3 ⁇ 4 86% 100% 3 105 ° C ⁇ 2 2.35 2h 30 2 hours 82% 100% 4 80 ° C ⁇ 2 2.3 1h 20 1h 20 45% 98% 5 110 ° C ⁇ 2 2.5 3h 3h 94% 99.5%
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Description
- Ar est un noyau aromatique, de préférence homocyclique ;
- les X semblables ou différents représentent un fluor ou un radical de formule CnF2n+1 avec n entier au plus égal à 5, de préférence à 2 ;
- p représente un entier au plus égal à 2 ;
- GEA représente un groupe hydrocarboné, un groupe électroattracteur dont les éventuelles fonctions sont inertes dans les conditions de la réaction, avantageusement fluor ou un reste perfluoré de formule CnF2n+1 avec un entier au plus égal à 8, avantageusement à 5 ;
- Le nombre total de carbones de -(CX2)p-GEA est avantageusement compris entre 1 et 15, de préférence entre 1 et 10.
- m est 0 ou un entier choisi dans l'intervalle fermé (c'est-à-dire comprenant les bornes) 1 à 4 ;
- R est un substituant inerte dans les conditions opératoires, avantageusement choisi parmi les halogènes avantageusement légers (c'est-à-dire chlore et fluor) et les radicaux hydrocarbonés, de préférence alcoyle, aryle, alcoylchalcogényle (tel que alcoyloxyle), arylchalcogényle (tel que aryloxyle) ;
- Z représente une liaison simple, un atome de chalcogène avantageusement léger (soufre et oxygène).
- Z représente une simple liaison ou un atome de chalcogène, où X1, X2, et parfois X3 représentent des halogènes semblables et différents, avec la condition qu'au moins deux halogènes soient différents du fluor ;
- R1 et R2 sont des substituants parmi les halogènes, les alcoyles, les aryles, les nitriles ;
- Le radical X3 peut être un groupe électroattracteur n'interférant pas avec la réaction et notamment peut être un groupe perfluoré, généralement désigné dans le domaine de la technique Rf.
En autoclave fermé (aucun dégazage) avec 2,2 eqt de chlore % pTFMA.
N° essai | pTFMA, nHF | Cl2 | T° | durée | TT pTFMA | RR monochloro PTFMA | RR dichloro pTFMA | Remarque |
1 | n = 4,5 m ≅ 10 g | 2,2 eqt | 80°C | 5 h | 95% | 1,5% | 19% | |
2 | " | 2,6 eqt | 110°C | 6 h | 93% | 0,9% | 2,4% | |
3 | " +MCB ≅ 50% en poids | 2.2 eqt | 110°C | 6 h | 60% | 0,6% | 0,8% | |
4 | Pas de MCB | 2,1 eqt | 80°C | 5 h | 93,5% | 1,2% | 25% | |
MCB signifie monochlorobenzène. |
N° essai | Température | Rapport molaire Cl2/pTFMA | Durée d'introduction du chlore | Durée d'introduction du substrat | Rendement de réaction | Taux de transformation |
1 | 115°C ± 2 | 3,25 | 2 h | 2 h | ≥ 99% | 99,9% |
2 | 105°C ± 2 | 3 | 2 h | 1h ¾ | 86% | 100% |
3 | 105°C ± 2 | 2,35 | 2h 30 | 2 h | 82% | 100% |
4 | 80°C ± 2 | 2,3 | 1h 20 | 1h 20 | 45% | 98% |
5 | 110°C ± 2 | 2,5 | 3h | 3h | 94% | 99,5% |
Claims (9)
- Procédé de synthèse d'une aniline chlorée sur le noyau et comportant au moins un atome de carbone d'hybridation sp3 à la fois perhalogéné et porteur d'un atome de fluor, caractérisé par le fait qu'il comporte une étape de chloration d'une aniline précurseur de ladite aniline chlorée, ladite chloration étant réalisée dans un milieu fluorhydrique susceptible d'échanger le chlore et le fluor en position benzylique.
- Procédé selon la revendication 1, caractérisé par le fait que ladite réaction est menée à une température comprise entre 0 et 150°C, avantageusement entre 20 et 120°C.
- Procédé selon l'une des revendications 1 et 2, caractérisé par le fait que la réaction est menée en pression atmosphérique ou en pression autogène.
- Procédé selon les revendications 1 à 3, caractérisé par le fait que l'on introduit le chlore progressivement par barbotage dans le milieu.
- Procédé selon l'une des revendications 1 à 4, caractérisé par le fait que l'on introduit le chlore de manière que le milieu reste toujours chlorant.
- Procédé selon l'une des revendications 1 à 5, caractérisé par le fait que dès que le barbotage de chlore cesse, on refroidit brutalement le mélange réactionnel.
- Procédé selon l'une des revendications 1 à 6, caractérisé par le fait que ledit caractérisé par le fait que ledit refroidissement est réalisé, au moins partiellement, par élimination de l'acide fluorhydrique sous pression réduite.
- Procédé selon l'une des revendications 1 à 7, caractérisé par le fait que l'aniline précurseur de ladite aniline chlorée est la p-trifluorométhylaniline.
- Procédé de synthèse d'un N-phénylpyrazole dichloré, en position ortho-ortho' du pyrazole, et portant en position para un groupe électroattracteur, avantageusement un atome de carbone d'hybridation sp3 à la fois perhalogéné et porteur d'un atome de fluor, caractérisé par le fait qu'il comporte une étape d'une aniline chlorée selon la revendication 1.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0002628 | 2000-03-01 | ||
FR0002628A FR2805809B1 (fr) | 2000-03-01 | 2000-03-01 | Chloration d'une aniline en ortho dans un milieu fluorhydrique |
PCT/FR2001/000578 WO2001064623A1 (fr) | 2000-03-01 | 2001-02-28 | Chloration d'une aniline en ortho dans un milieu fluorhydrique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1259476A1 EP1259476A1 (fr) | 2002-11-27 |
EP1259476B1 true EP1259476B1 (fr) | 2005-10-05 |
Family
ID=8847594
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01909919A Expired - Lifetime EP1259476B1 (fr) | 2000-03-01 | 2001-02-28 | Chloration d'une aniline en ortho dans un milieu fluorhydrique |
Country Status (11)
Country | Link |
---|---|
US (1) | US6747175B2 (fr) |
EP (1) | EP1259476B1 (fr) |
JP (1) | JP4777578B2 (fr) |
CN (1) | CN1273440C (fr) |
AT (1) | ATE305915T1 (fr) |
AU (1) | AU3751001A (fr) |
DE (1) | DE60113813T2 (fr) |
ES (1) | ES2246313T3 (fr) |
FR (1) | FR2805809B1 (fr) |
HU (1) | HUP0300149A3 (fr) |
WO (1) | WO2001064623A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2846325B1 (fr) | 2002-10-25 | 2006-09-08 | Bayer Cropscience Sa | Nouveau procede de preparation d'un intermediaire de synthese de pesticide |
CN101061090B (zh) * | 2004-11-05 | 2011-06-15 | 国立大学法人北海道大学 | α,α-二氟胺的制备方法 |
CN103910639A (zh) * | 2014-03-13 | 2014-07-09 | 凯美泰克(天津)化工科技有限公司 | 一种制备2,6-二氯-4-三氟甲基苯胺的方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2558464B1 (fr) * | 1984-01-20 | 1986-05-09 | Rhone Poulenc Spec Chim | Procede de preparation de trifluoromethylanilines |
US4766243A (en) * | 1984-08-10 | 1988-08-23 | Occidental Chemical Corporation | Electrophilic fluorination of aromatic compounds |
DE3933093A1 (de) * | 1989-10-04 | 1991-04-11 | Bayer Ag | Verfahren zur herstellung von 2,4- bzw. 2,6-dihalogen-anilin |
DE4328028A1 (de) * | 1993-08-20 | 1995-03-02 | Hoechst Ag | Verfahren zur Herstellung von Trifluormethylanilinen |
FR2751326B1 (fr) * | 1996-07-16 | 1999-08-20 | Rhone Poulenc Chimie | Procede de preparation de derives halogenes du 2-amino ou du 2-acetamido trifluoromethylbenzene |
-
2000
- 2000-03-01 FR FR0002628A patent/FR2805809B1/fr not_active Expired - Fee Related
-
2001
- 2001-02-28 CN CNB018058612A patent/CN1273440C/zh not_active Expired - Fee Related
- 2001-02-28 US US10/204,942 patent/US6747175B2/en not_active Expired - Fee Related
- 2001-02-28 AU AU37510/01A patent/AU3751001A/en not_active Abandoned
- 2001-02-28 HU HU0300149A patent/HUP0300149A3/hu unknown
- 2001-02-28 AT AT01909919T patent/ATE305915T1/de not_active IP Right Cessation
- 2001-02-28 EP EP01909919A patent/EP1259476B1/fr not_active Expired - Lifetime
- 2001-02-28 ES ES01909919T patent/ES2246313T3/es not_active Expired - Lifetime
- 2001-02-28 DE DE60113813T patent/DE60113813T2/de not_active Expired - Lifetime
- 2001-02-28 WO PCT/FR2001/000578 patent/WO2001064623A1/fr active IP Right Grant
- 2001-02-28 JP JP2001563467A patent/JP4777578B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP1259476A1 (fr) | 2002-11-27 |
ES2246313T3 (es) | 2006-02-16 |
HUP0300149A2 (en) | 2003-05-28 |
ATE305915T1 (de) | 2005-10-15 |
JP4777578B2 (ja) | 2011-09-21 |
HUP0300149A3 (en) | 2004-07-28 |
CN1406222A (zh) | 2003-03-26 |
CN1273440C (zh) | 2006-09-06 |
FR2805809B1 (fr) | 2003-08-08 |
JP2003525265A (ja) | 2003-08-26 |
US6747175B2 (en) | 2004-06-08 |
AU3751001A (en) | 2001-09-12 |
US20030130542A1 (en) | 2003-07-10 |
DE60113813T2 (de) | 2006-06-29 |
WO2001064623A1 (fr) | 2001-09-07 |
DE60113813D1 (de) | 2006-02-16 |
FR2805809A1 (fr) | 2001-09-07 |
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